Imam Sadiq (as) on reciting the Quran.

Whoever recites the Qur'an and does not humble himself before Allah,
whose heart is not softened, nor regret and fear provoked within him,
undervalues the immensity of Allah's affair and is in a clear state of loss.
The person who recites the Qur'an needs three things: a fearful heart, a
tranquil and receptive body, and an appropriate place to recite. When his
heart fears Allah, then the accursed Satan flees from him. As Allah said,

When you recite the Qur'an, seek refuge with Allah from the accursed
Shaytan. (16:98)

When he frees himself of all attachments, then his heart is devoted to
recitation, and nothing impedes him from obtaining the blessing of the
light of the Qur'an and its benefits. When he finds an empty place and
withdraws from people, having acquired the two qualities of humility of
heart and tranquility of body, then his soul and his innermost being will
feel communion with Allah, and he will discover the sweetness of how
Allah speaks to His right-acting bondsmen, how He shows His gentleness,
to them and singles them out for all the varieties of His marks of
honour and wondrous signs. If he drinks a cup of this drink, he will never
prefer any other state to this nor any other moment to this. He will
prefer this to every act of obedience and devotion, since it contains intimate
conversation with the Lord, without any intermediary.
So beware of how you read the Book of your Lord, the guardian to
whom you aspire, how you respond to His commands and avoid His
prohibitions, and how you observe His limits, for it is a mighty
Book: 

Falsehood shall not come to it from before it nor from behind it,
a revelation from the Wise, the Praised One. (41:42)

Therefore recite it in an orderly manner and contemplatively and adhere
to the limits of His promise and His threat. Reflect on its examples
and warnings. Beware of paying undue respect to the recitation of its letters
while failing to observe the legal limits contained therein.

__________________________________________________
Hadith from Lantern of Path book, Chapter 13 of the book.